Insulating nonwoven fabric and method for manufacturing the same, insulating material

Patent metadata

Field	Value
Publication number	US-10526736-B2
Application number	US-201515129254-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Mar 27, 2014
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

Provided are a nonwoven fabric mainly composed of amorphous polyetherimide having a melt viscosity at 330° C. of 100 to 3000 Pa·s, and satisfying conditions of: 1) an average fiber diameter of 0.5 to 5 μm; 2) an air permeability of more than or equal to 20 seconds/100 mL; and 3) a withstand voltage of more than or equal to 15 kV/mm, an insulating material using the nonwoven fabric, and a method for manufacturing the nonwoven fabric including continuously treating fibers between a pair of rolls at a temperature of 150 to 300° C. and a linear pressure of 100 to 500 kg/cm.

First claim

The invention claimed is:

1. A nonwoven fabric, comprising an amorphous polyetherimide having a melt viscosity at 330° C. of 100 to 3000 Pa·s, and satisfying conditions of:
1) an average fiber diameter of 0.5 to 5 μm;
2) an air permeability of at least 20 seconds/100 mL; and
3) a withstand voltage of at least 20 kV/mm.

2. The nonwoven fabric according to claim 1 , wherein the nonwoven fabric has a vertical strength of at least 15 N/15 mm.

3. The nonwoven fabric according to claim 1 , wherein the nonwoven fabric has a density within a range of 0.65 to 1.25 g/cm 3 .

4. An insulating material comprising the nonwoven fabric according to claim 1 .

5. A method for manufacturing the nonwoven fabric according to claim 1 , comprising continuously treating fibers between rolls arranged to face each other, at a temperature of 150 to 300° C. and a linear pressure of 100 to 500 kg/cm.

6. The method for manufacturing the nonwoven fabric according to claim 5 , wherein the rolls arranged to face each other are an elastic roll whose surface has a Shore D hardness of 85 to 95° and a metal roll.

7. The method for manufacturing the nonwoven fabric according to claim 5 , wherein the continuously treated fibers are manufactured with a melt blown method or a spunbond method.

Assignees

• Kuraray Co

Inventors

• Shirotani Yasuhiro

Classifications

• D10B2401/04

  Heat-responsive characteristics · CPC title

• D04H1/56

  in association with fibre formation, e.g. immediately following extrusion of staple fibres · CPC title

• D04H1/4326

  Condensation or reaction polymers · CPC title

• D04H3/009 Primary

  Condensation or reaction polymers · CPC title

• D04H1/54

  by welding together the fibres, e.g. by partially melting or dissolving (in combination with needling D04H1/485) · CPC title